Firearm rear sight



FIG. 1 is a perspective view of a firearm rear sight showing my new design;

FIG. 2 is a left-side elevation view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a right-side elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is bottom plan view thereof.

The broken lines and the areas within them depict portions of the firearm rear sight that form no part of the claimed design. The dot-dash-dot broken lines in FIG. 6 form a boundary of the claim and form no part thereof. 

CLAIM The ornamental design for a firearm rear sight, as shown and described. 